Automotive Steering Knuckles Market Size, CAGR & Forecast, 2025-2035

Aluminum knuckles for electric and hybrid platforms are taking value share from cast iron

Automotive steering knuckles generated USD 8.64 Billion in 2025 and should reach USD 9.00 Billion in 2026 and USD 12.94 Billion by 2035 at a CAGR of 4.12% under the Radial Insights base case. Values in this report are in USD Billion unless stated otherwise, and the 2025 base of USD 8.64 Billion grows by about half over the decade as heavier electric vehicles and lighter aluminum designs lift the value of each part.

The automotive steering knuckles market covers the cast or forged component that joins the wheel hub and bearing to the suspension arms, struts and tie rods, on steered front axles and on rear axles that carry knuckles or uprights. It includes ductile cast iron, forged steel, cast aluminum and forged aluminum parts sold to carmakers and tier-one chassis module makers, and replacement knuckles sold in the aftermarket. We exclude complete corner modules, hub bearings, ball joints and control arms, except where those parts are sold as part of a knuckle assembly price that we can separate.

Volume follows vehicle output. OICA counted 96.4 million motor vehicles built worldwide in 2025, up 3.9%, with China alone at 34.53 million. Every light vehicle carries at least two knuckles, and most carry four once rear uprights are counted, so the market moves with production, then gets an extra push from material mix.

Battery electric vehicles are the fastest-growing segment at a 9.10% CAGR, because their extra mass needs stronger knuckles and their range targets favor aluminum. Forged aluminum is the fastest-growing material at 6.65%. Africa is the fastest-growing region at 4.80% from a small base, while Asia Pacific (APAC) remains the largest market by far.

Quality and trade policy are shaping supplier choice. NHTSA probes and recalls involving cracked aluminum and cast knuckles in 2025 and 2026, and US tariffs of 25% on imported auto parts and 50% on steel and aluminum content, are pushing carmakers to qualify regional casting and forging sources with strong process control.

Aluminum materials and electrified platforms grow two to three times faster than the market average

Radial Insights splits the automotive steering knuckles market into five dimensions. The widest spread of growth rates appears in propulsion and material, which are linked: electrified platforms specify aluminum far more often than combustion platforms do. The table lists every segment and its CAGR for 2025-2035.

Forged aluminum grows fastest among materials as carmakers chase unsprung-mass savings

Ductile cast iron is still the most common material on mass-market cars, light trucks and commercial vehicles because it is cheap and forgiving to machine, but it grows at only 2.85%. Forged steel follows at 3.40%, supported by heavy-duty pickups and commercial vehicles. Cast aluminum, made by low-pressure or squeeze casting, grows at 6.10%. Forged aluminum grows fastest at 6.65%, because it gives the best strength-to-weight ratio for heavy electric SUVs and premium sedans. European Aluminium and Ducker Carlisle data show average aluminum content in EU cars rising from 174 kg in 2019 to 205 kg in 2022, with 237 kg forecast for 2026, and chassis parts such as knuckles are a large part of that gain.

Light commercial vehicles edge out passenger cars

Passenger cars, the biggest vehicle segment, grow at 4.05%. Light commercial vehicles grow slightly faster at 4.30% as electric vans with high payloads need stronger, heavier-section knuckles. Heavy commercial vehicles grow at 3.55%, held back by slower truck output and long replacement cycles.

Battery electric demand is the main engine of value growth

Knuckles on combustion vehicles grow at only 1.35% as that output plateaus. Hybrids grow at 6.85% and battery electric vehicles at 9.10%. The IEA counted more than 20 million electric car sales in 2025, about a quarter of new car sales, and expects about 23 million in 2026. A battery electric car is often 300 kg to 500 kg heavier than a comparable combustion car, so knuckles need more section or better materials, and value per vehicle rises.

Rear knuckles grow faster as multi-link and rear-steer designs spread

Front steering knuckles grow at 3.95%. Rear knuckles and uprights grow at 4.45% because multi-link rear suspensions, common on electric platforms with rear motors, use cast or forged uprights rather than simple beam axles, and some premium models add rear-wheel steering.

Aftermarket grows faster than OEM on an aging fleet

OEM supply grows at 4.02%. The aftermarket grows at 4.70% as fleets age and pothole and collision damage drive replacement. Dorman Products, a leading US aftermarket supplier with knuckles in its range, reported 6.0% sales growth for 2025.

Market Trends

Consolidation among aluminum chassis casters

In October 2025, Linamar agreed to buy the North American operations of Aludyne for USD 300 million and completed the purchase in November 2025. Aludyne makes lightweight aluminum knuckles, subframes, control arms and axle housings, and its plants now sit in the Linamar Structures group. The deal gives Linamar scale in a product family where carmakers want fewer, larger suppliers that can handle both casting and machining.

Indian forgers buy capacity abroad and at home

In July 2025, Bharat Forge completed its acquisition of 100% of AAM India Manufacturing, at an equity value of about INR 7,464.6 million. Bharat Forge, part of the Kalyani group, already supplies forged steel and aluminum chassis parts, knuckles included, from India, Germany and the US. Indian forgers are using cost advantage and new capacity to win export programs from carmakers that want alternatives to Chinese suppliers.

Japanese chassis groups restructure ownership

In December 2025, Honda and Hitachi agreed that Honda would buy another 21% of Astemo for about JPY 152.3 billion, taking its stake from 40% to 61%. Astemo supplies suspension and steering systems, and closer ties to a carmaker shape where it sources castings and forgings.

Recalls raise the bar for casting quality

In February 2026, Hyundai filed recall 26V069 for 2026 Kona gasoline models built between October and December 2025, because front steering knuckles from supplier Myunghwa may have been improperly cast after a mold repair and could crack. In April 2026, NHTSA upgraded its probe into front aluminum knuckle fractures on Range Rover and Range Rover Sport models to an engineering analysis covering 331,559 vehicles. Carmakers are responding with more X-ray inspection, tighter mold maintenance rules and second-source qualification.

Restraints and Challenges

Tariffs on parts and metals

A Section 232 proclamation of March 2025 set a 25% tariff on imported autos from April 2025 and on auto parts from May 2025, with USMCA-qualifying parts exempt for the time being. In June 2025, steel and aluminum tariffs rose to 50% (White House proclamation). Knuckles shipped from Asia or Europe to US assembly plants now carry a large cost penalty, and North American casters face higher metal input costs.

Safety recalls and liability

Knuckles are safety-critical, and a casting defect can let a wheel separate from the suspension. NHTSA documents for the Hyundai Kona recall describe knuckles that may crack or fracture after an improperly cast batch (NHTSA recall report 26V069). Each recall adds inspection cost and makes carmakers slow to approve new suppliers.

Slow combustion vehicle output in Europe and the Americas

OICA data show European production down 0.8% to 17.2 million vehicles in 2025 and output in the Americas down 2.1% to 18.74 million. Mature regions therefore grow below the global average, and cast iron capacity there is underused.

Aluminum price swings

Aluminum knuckles cost more per part than iron ones, and casters pass metal costs on with a lag. Sharp moves in aluminum prices, tariffs on ingot and scrap, and energy costs in Europe squeeze margins on fixed-price programs.

Growth Drivers

Electric vehicle mass and range targets

Battery packs add several hundred kilograms to a vehicle, which raises the loads a knuckle must carry under braking, cornering and pothole impact. At the same time, range targets push engineers to cut unsprung mass, and an aluminum knuckle can weigh 30% to 40% less than an iron one of similar stiffness, according to casters we interviewed. The IEA counted more than 20 million electric car sales in 2025 and expects about 23 million in 2026, and China built 16.626 million new energy vehicles in 2025, up 29%, per OICA. Suppliers such as Ningbo Tuopu, a Tesla chassis supplier, and Linamar have grown aluminum chassis capacity to meet this demand. Radial Insights estimates that electrification adds about +1.6% of annual growth to the automotive steering knuckles market through 2035, mostly through higher value per vehicle rather than more units.

Rising light vehicle output in Asia

OICA reports that Asia-Pacific built about 59.2 million vehicles in 2025, up 7.6% and more than 61% of the world total. China added about 3.25 million units, India reached 6.49 million and Japan 8.41 million. New vehicle plants in India, Indonesia, Thailand and Vietnam need local knuckle supply, and Korean and Japanese chassis groups such as Hyundai Mobis, Hyundai Wia, Astemo, Ryobi and Ahresty follow their customers there. We attribute roughly 1.1 percentage points of the 4.12% CAGR to Asian volume growth, which is also why Asia Pacific (APAC) grows at 4.70%. Chinese brands building plants abroad, in Thailand, Brazil, Hungary and Turkey, also take local knuckle suppliers with them or create demand for new local sources.

Regional sourcing under tariffs and USMCA rules

The 25% Section 232 tariff on imported auto parts, the 50% tariff on steel and aluminum, and the exemption for USMCA-qualifying parts reward knuckle production inside North America. Linamar's USD 300 million purchase of Aludyne's North American plants fits this shift, as does the steady flow of new machining cells that tier-one chassis suppliers are adding in Mexico. Carmakers that once imported finished knuckles from Asia are re-sourcing to Mexico, the US and Canada, which raises local prices and adds machining work. Radial Insights credits nearshoring with about +0.5% a year of extra value growth, concentrated in North America, where demand rises from about USD 1,607.0 Million in 2025 to USD 2,266.9 Million by 2035. The same logic is spreading to Europe, where carmakers ask for local or EU-qualified chassis castings to reduce exposure to long supply chains.

Opportunities

Forged aluminum and hybrid cast-forge processes

Forged aluminum is the fastest-growing material at 6.65%. Suppliers that master cast-forge and squeeze-casting processes can offer forged-level strength at lower cost, which suits mid-priced electric SUVs and pickups.

Integrated corner modules and sensor-ready knuckles

Brake-by-wire, steer-by-wire and wheel-speed sensing are moving more function to the wheel corner. Knuckle makers that machine in sensor mounts and deliver pre-assembled corner modules with hubs and bearings can capture more value per vehicle.

Asia Pacific holds more than half of knuckle demand, while North America gains from nearshoring

Asia Pacific (APAC)

Asia Pacific (APAC) accounts for a 54.30% share of the automotive steering knuckles market in 2025, about USD 4,691.5 Million. Asia Pacific (APAC) demand grows at a 4.70% CAGR to about USD 7,426.4 Million by 2035. In Asia Pacific, China built 34.53 million vehicles in 2025, including 16.626 million new energy vehicles, and India built 6.49 million. Asia Pacific suppliers such as Ningbo Tuopu, Myunghwa and Hyundai Wia are among the main sources, and Japan's 8.41 million vehicles add a third large hub.

North America

North America holds an 18.60% share, about USD 1,607.0 Million in 2025. Demand in North America grows at a 3.50% CAGR to about USD 2,266.9 Million by 2035. Within North America, the United States built 10.24 million vehicles in 2025, and the 25% Section 232 tariff on imported parts favors USMCA-qualified production in North America. Linamar's November 2025 purchase of Aludyne's North American plants and Dorman's 2025 net sales of USD 2,130.3 million show activity on both the OEM and aftermarket sides.

Europe

With a 19.20% share, Europe accounted for about USD 1,658.9 Million in 2025. Europe grows at 2.90% a year, the slowest of any region, to about USD 2,207.8 Million by 2035, as European production slipped 0.8% to 17.2 million vehicles in 2025. Aluminum content in EU cars is forecast at 237 kg per vehicle in 2026, up from 205 kg in 2022, which keeps value per vehicle rising even as volumes stall.

Latin America

Latin America has a 4.90% share, worth about USD 423.4 Million in 2025. Latin America grows at a 4.10% CAGR to about USD 632.7 Million by 2035. In Latin America, Brazil built 2.64 million vehicles in 2025, and Mexican casters supplying US assembly benefit from the USMCA exemption from parts tariffs.

Middle East

The Middle East holds a 1.80% share, about USD 155.5 Million in 2025. Middle East demand increases at 4.40% a year to about USD 239.2 Million by 2035. Turkey is the main Middle East production base, with BYD building a plant in Manisa and the domestic Togg brand in production, while Saudi Arabia hosts Lucid's assembly plant at King Abdullah Economic City.

Africa

With a 1.20% share, Africa accounted for about USD 103.7 Million in 2025. Africa grows fastest of all regions at 4.80% a year, reaching about USD 165.7 Million by 2035. OICA reports African vehicle sales up 22% in 2025, from 1.05 million to 1.29 million units, and Morocco and South Africa host export-focused assembly plants that use imported and local chassis parts.

Recent Developments

• In April 2026, NHTSA opened engineering analysis EA26003 into front aluminum steering knuckle fractures on 2014-2022 Range Rover and Range Rover Sport models, covering 331,559 vehicles.

• In February 2026, Hyundai announced recall 26V069 for 4,555 potentially affected 2026 Kona gasoline models whose front steering knuckles, supplied by Myunghwa, may have been improperly cast.

• In February 2026, Dorman Products announced 2025 net sales of USD 2,130.3 million, up 6.0%, and issued 2026 guidance tied to tariff timing.

• In December 2025, Honda signed an agreement with Hitachi to buy another 21% of Astemo for about JPY 152.3 billion, lifting its stake to 61%.

• In November 2025, Linamar completed its USD 300 million acquisition of Aludyne's North American operations, a maker of aluminum knuckles, subframes and control arms.

• In July 2025, Bharat Forge completed its acquisition of 100% of AAM India Manufacturing for an equity value of about INR 7,464.6 million.

Integrated casters and forgers with machining and assembly capacity are winning the largest programs

The automotive steering knuckles market is fragmented. Radial Insights estimates that the ten largest suppliers hold under half of global value, with many regional foundries and forge shops serving one or two carmakers. Competition rests on metallurgy, process control and inspection, machining capacity, and the ability to deliver finished, assembled knuckles close to assembly plants.

Aluminum chassis specialists

Linamar, through its Structures group and the former Aludyne North American plants, is now one of the largest makers of aluminum knuckles, subframes and control arms in North America. Aludyne keeps operations outside North America. Nemak, based in Mexico, is moving from engine castings into structural and electric vehicle castings. Ningbo Tuopu Group makes lightweight aluminum chassis parts and supplies Tesla and Chinese electric vehicle makers. Ryobi and Ahresty, both Japanese die-casters, supply aluminum parts to Japanese carmakers in Asia and North America.

Forging groups

Bharat Forge, the Kalyani group's flagship, forges steel and aluminum knuckles and other chassis parts in India, Germany and the US, and expanded its Indian base with AAM India Manufacturing in July 2025. CIE Automotive of Spain runs forging, casting and machining plants across Europe, the Americas and India. Sakthi Automotive supplies ductile iron knuckles from India and the US.

Chassis system groups

ZF Friedrichshafen supplies complete suspension and chassis modules, including knuckle assemblies, to global carmakers. Astemo, now controlled by Honda, supplies suspension and steering systems. Hyundai Mobis builds chassis modules for Hyundai and Kia, and Hyundai Wia makes chassis parts and modules. Myunghwa casts knuckles for Hyundai and Kia and was named as the supplier in the 2026 Kona recall.

Aftermarket suppliers

Dorman Products is a leading US aftermarket supplier of steering knuckles and other chassis parts, with 2025 net sales of USD 2,130.3 million. MOOG, now part of Tenneco through DRiV, sells chassis and steering parts to repair shops. Aftermarket suppliers compete on catalog coverage, fast fitment data and price, and they are exposed to tariffs because most parts are imported.